AirHint found the following cheapest return flights from Athens (ATH) to Ljubljana (LJU) in September 2025 (see full year).

Return flights

17 Sep - 21 Sep	Air Serbia
12 Sep - 21 Sep	Air Serbia
16 Sep - 21 Sep	Air Serbia
13 Sep - 15 Sep	Air Serbia
12 Sep - 15 Sep	Air Serbia
25 Sep - 30 Sep	Air Serbia
13 Sep - 14 Sep	Air Serbia
17 Sep - 22 Sep	Air Serbia
12 Sep - 16 Sep	Air Serbia
19 Sep - 20 Sep	Air Serbia
30 Sep - 06 Oct	Air Serbia
29 Sep - 02 Oct	Air Serbia
29 Sep - 05 Oct	SKY express
30 Sep - 03 Oct	Wizz Air Malta
30 Sep - 07 Oct	SKY express
28 Sep - 02 Oct	Wizz Air Malta
30 Sep - 04 Oct	Air Serbia
29 Sep - 03 Oct	Air Serbia
30 Sep - 07 Oct	Aegean Airlines	direct
30 Sep - 03 Oct	Aegean Airlines	direct

Also check the deals for one-way flights from Athens to Ljubljana in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Athens to Ljubljana in September from 198€

Return flights